dude you call a locksmith. you know, those guys that drives a little geo metro around that has a big sign "locksmith" on the side of the car. they can slim jim your window to open the door( if you have it locked) and then take out the key lock and then they take it to there car and make a key for you from there machine thats in there trunk. pretty koo thing cause i did this once but they charged me 70 bucks for it. well lesson to learn, next time make a few more copies of that key so you wouldn't spend a bunch.